Magnetic Track Lighting Layout Guide: Runs, Corners and Fixture Mixes

Most magnetic track lighting layout problems are already sitting in the first sketch. Heads come off and go back on in seconds. The rail doesn't. Wherever it gets screwed to the ceiling is where every bit of light in that room will come from, for as long as the ceiling stays up.

So treat this as review notes: roughly what we'd scribble in the margin of a plan someone sends over. Read them against your own sketch.

Rub out the centre line first

Picture a familiar first sketch: a rectangle, one straight run down the middle, five heads evenly spaced.

Tidy. Built, it lights the rug.

The pictures, shelves and curtains are all on the walls, and they get whatever spills off the edge of the beam. Then someone turns everything to full and still says the room feels gloomy. Our note on that sketch, in one line: where's the furniture?

Circle things, write one word beside each

Slide a furniture plan under the ceiling plan. Provisional is fine. Pencil is fine.

Circle what genuinely needs light. Reading chair. Picture wall. The bit of worktop where you'd otherwise chop onions in your own shadow. Dining table, bookcase. Give the hallway a circle too, though all it asks for is enough light to walk through.

Beside each circle: accent, wash or fill. Nothing fancier yet.

Now look for circles that sit close together. Say the table sits about 1.5 m from the long picture wall. Do you need two runs? Probably not. A couple of spots over the table, the rail turns, a wall washer rides along the wall. One line in the ceiling, two jobs.

Commercial designers go a step further and set target light levels per task, normally from recommended practice published by the Illuminating Engineering Society. You won't be doing lux sums for a flat. Still, if your plan gives the hallway and the worktop the same row of heads at the same spacing, it's fair to ask whether anyone decided what either space is for.

How far off the wall

This is the question to settle before any other. We can't answer it without the ceiling height, so write that number in a corner of the sketch. Big. Circled.

Too far into the room and the beam lands on the floor in front of the wall. Too close and it rakes straight down the surface: a hot stripe under the ceiling, a frame shadow down the canvas, every ripple in the plaster on show. If a run on your drawing is within a hand's width of the wall, expect it back with a red ring round it.

Room shape pushes you around too. Long room, open office, shop aisles? Parallel runs, so heads can follow desks and displays when they shift. A bedroom or living room with no ceiling fitting tends to get a loop round the edge, which pulls light onto every wall. Corridor or galley kitchen: one spine, because there isn't width for anything else.

Don't count on dimming to rescue placement. Too bright dims down. Too far away doesn't come any closer from a control panel.

Corners, curves, and a number beside every straight

On a recessed run, any corner you didn't draw gets invented on the day by whoever's up the ladder. Sometimes that works out. Often it's a visible joint, or the line stops and picks up again a few centimetres further on. Margin note, in capitals if needed: don't let the installer invent corners.

The 48V 26mm ultra-thin profile has right-angle and rounded corner pieces, so a recessed loop can go all the way round without a break. Which one? Choose it on paper. Once the line is lit, a sharp turn and a soft radius look like two different ceilings.

Curved bulkhead? The 48V semi-flexible track can bend to follow it. How tight it'll go depends on the product, so sketch the real curve and we'll check it against what's made. The low-voltage profiles are on the 48V series page.

For M25, M35 and the other 48V profiles, we pick corner and connector parts off your drawing rather than a generic parts list. How the run turns and how it's fixed both change the answer.

Now lengths. Write each straight's length right beside it, in metres. Depending on the model, straight track comes in 1.0, 1.5, 2.0 or 3.0 m, and not every model offers all four. Say a wall run measures out at 3.1 m. Pull the end back 10 cm and, if that model has a 3.0 m piece, it's one length: no join, no offcut in the skip. Small nudges like that are cheap on paper and annoying on site.

What shares a run (and what can't)

Mixing heads on one rail is normal. It's half the reason to use magnetic track. Draw rough symbols for them even though they'll move; it shows at a glance when one end is crowded and the other's bare.

A shop run, hypothetically: spots along the shelving, then a grille light over the aisle, where several small optics in one bar give steadier light and less glare. A living-room loop might carry fill lights on the long sides, two spots by the art, a linear light above the sideboard.

The rule that gets broken is one series per run. The range covers spotlights, grille lights, flood or linear fill, linear lights and wall washers, but the M25 list isn't the M35 list, and neither lines up exactly with every 48V profile. A head made for one slot won't seat in another, however similar the photos look. Where does the mix-up come from? Usually a project specified twice, by two people, months apart.

Control needs the same check. Smart and non-smart heads on one run won't answer to the same app or remote. If the building is going onto a central system, that's often DALI, the protocol maintained by the DALI Alliance. Whether a particular head can join depends on that head, so get the list confirmed before anyone designs scenes. Anything we can't confirm, we mark as unconfirmed.

One annotation people find odd: leave this stretch empty. A bare metre at handover looks like somebody forgot something. It's where the next display goes, or the next tenant's, or the light for the sofa after it wanders across the room. Nobody opens the ceiling.

Screwed on, sunk in, or hung

Surface. Rail fixed to finished plaster. You'll see that black or white line every day with the lights off, so line it up with something that's really there: a window reveal, the kitchen units, the long axis of the table. A surface run at a random angle just reads as a mistake.

Recessed. Only the slot shows. Needs the ceiling open and enough void for the profile. Boards already up? Most people switch to surface rather than cut back in.

Suspended. Cables or rods, for double-height rooms, bare concrete, warehouse-style shops. Drop height turns into a design call, because the rail now sits in everyone's eyeline.

And on any 48V plan, mark the driver box with an access panel beside it. It is easy to leave blank on a first drawing, and the worst to add after plasterboard. Where drivers tend to end up is covered in our 48V and 220V comparison.

Three made-up rooms

None of these are real projects. They're here to show the thinking, not to be copied.

Low living room, no main light. Recessed 48V 26mm ultra-thin loop round the perimeter. Rounded corners if the room's soft, right-angle if it's crisp. Fill lights down the long sides, spots bunched near the art, empty rail on whichever side the sofa will probably drift to. Driver box over the hall cupboard, panel marked on the plan.

Small shop, high ceiling. Parallel M35 runs over the display zones, carrying the bigger spots staff move when stock changes. Wall washers on the back wall only if that family is offered on M35 for this job; confirm it before it goes on the drawing. Last section of each run left bare.

Corridor. One spine. 48V 20mm, probably. Or the ultra-thin light-strip system, if the line itself is meant to glow.

Other room types are on the applications page. Still undecided on voltage or slot width? Our guide to choosing a system comes first; this page assumes that's settled.

Short on budget? Cut heads, keep rail

Heads from the same series can be added any afternoon, as long as the feed has capacity for them. More rail on a recessed run means opening the ceiling again; surface and suspended runs are easier to extend, but still need a new fixing and feed check. A short stub carrying three heads with nowhere to slide is basically a fixed fitting with a magnet in it.

Furniture still undecided? Give the zone most likely to change (dining, usually) more rail than it seems to need.

Last check. Sit on the sofa, the bed, the stool at the island, in your head if nowhere else, and look up. A spot aiming past the painting and into your eyes? Move the run. Not the sofa.

What to send us

A phone photo of the ceiling with lines drawn on it is enough. CAD's welcome, not required.

On it: the length of each run, one word for each run's job, ceiling height, open or finished, a voltage preference if you've got one. On 48V, where you think the driver could live. Don't know? Leave it blank and we'll read it as a question.

Send it through the contact page. You'll get back a suggested series and profile, and a cut list built from lengths that actually exist for that model. Want to compare profiles first? They're side by side in the series index.